My 12 x 12 Alaknak has worked well, although only three years. I use it for fly-ins and short portaging into a wilderness area, where poles cannot be cut. Must have a vestibule for long trips or more than a couple guys, or if you like to change clothes, shoes(which I recommend), etc before you get inside the main area. It need lots of tie-down/stake spots, so bedrock is a pain to deal with. Like has been said, use a small wood stove. Spark arrestor is a must, as the material melts easily. Mine has beer holders on the walls.
I use an "eco fan" on the stove. It really helps.
In general, I'd say that if you take care of it, as I do, it will serve you well. If you are going to treat it roughly, get a wall tent. If it will be used for more than a week or so at a time, get a wall tent. If you or your buddies are rowdy or drinkers, get a wall tent.
If used in the most horrible weather (blizzard or something), get a wall tent.